Khalid Abdulla, Andrew Wirth, et al.
ICIAfS 2014
The closure properties of the class of languages defined by real-time, online, multi-tape Turing machines are proved. The results obtained are, for the most part, negative and, as one would expect, asymmetric. It is shown that the results remain valid for a broad class of real-time devices. Finally, the position of the class of real-time definable languages in the 舠classical舡 linguistic hierarchy is established. © 1967, ACM. All rights reserved.
Khalid Abdulla, Andrew Wirth, et al.
ICIAfS 2014
Hong Guan, Saif Masood, et al.
SoCC 2023
Saurabh Paul, Christos Boutsidis, et al.
JMLR
Ronald Fagin
Journal of the ACM